Thhs test was not meant to be executed

I guess the `and` was meant to disable the assert. Now commenting it out with `#`.

Author: DimitriPapadopoulos

xarray/tests/test_dask.py

@@ -1130,7 +1130,7 @@ def test_unify_chunks_shallow_copy(obj, transform):
     obj = transform(obj)
     unified = obj.unify_chunks()
     assert_identical(obj, unified)
-    assert obj is not obj.unify_chunks()
+    # assert obj is not obj.unify_chunks()
 
 
 @pytest.mark.parametrize("obj", [make_da()])